<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JS 模块化 2</title>
    <link rel="stylesheet" href="./style.css">
    <script type="module" src="./lesson.js"></script>
</head>

<body>
    <button id="addBtn">点击加载加法模块</button>
    <button id="subBtn">点击加载减法模块</button>
    <p id="result"></p>
</body>

</html>